/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/MeshSimplification.h
Maximally collapse mesh in a way that does not change shape at all. This process does not involve quadric error at all.
virtual void SimplifyToMinimalPlanar ( double CoplanarAngleTolDeg, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(int32 EdgeID)> EdgeFilterPredicate )